\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{circuitikz}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes,}
\ctikzset{bipoles/length=1cm}
\begin{document}
\small
\begin{circuitikz}[>=latex, scale=1.0,european]
  % \useasboundingbox(0.9,0)rectangle(5.1,5);
  \draw (0,0) to [battery2] (6,0)--(6,1) to [rmeter, t=V, *-*] (0,1)--(0,0);
  \draw (0,1)--(0,2) to [rmeter, t=A] (2,2)--(3.9,2) to[pR,name=pr] (4.7,2);
  \draw (6,1)--(6,2.7)--(6,2.7-|pr.wiper)--(pr.wiper)node[left]{$P$};
\end{circuitikz}
\end{document}